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I am seeing similar performance issues with STS 2.9.1 running under Ubuntu 11.10 (VirtualBox). I have plenty of processor power (the vm has 3 3GHz Xeon processors) and memory (4GB), so that shouldn't be an issue.

It is so slow to build a war and deploy it that when I try to test with the vFabric tc Server the server times out!

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I just replied to your thread on grails-user. As Andrew mentioned, look in the STS error log (accessible through Window>ShowView>ErrorLog - or some other similar path to showview on windows). Does it have anything unexpected in it?

In other words, it turned out that memory and some processor overhead were causing the problems. I started top and looked at how much vm STS was using and realized that between STS, Firefox, and Ubuntu I was woefully short of VM. I also found some comments on the web that VB folder sharing could cause delays (from being based on Samba).

So I bumped the available memory, ended using Firefox (Chrome uses about 50% of the VM in my usage patterns), and switched off shared folders. STS is quite responsive now and usable.

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Thanks for the feedback Mike. There is now an issue open related to the slowness that QuantumUniverses was seeing which doesn't sound memory related (but you never know) https://issuetracker.springsource.com/browse/STS-2570 . Under that jira I'm asking for stacktraces (jstack) when it is on a 'go slow' to see if we can pinpoint what it is doing.